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BUG: KCSAN: data-race in attach_to_pi_owner / futex_wait_queue_me

write to 0xffff8880b615c0a4 of 4 bytes by task 14127 on cpu 0:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 futex_wait_queue_me+0x1a8/0x250 kernel/futex.c:2634
 futex_wait_requeue_pi kernel/futex.c:3281 [inline]
 do_futex+0x1807/0x21c0 kernel/futex.c:3831
 __do_sys_futex kernel/futex.c:3872 [inline]
 __se_sys_futex+0x26d/0x330 kernel/futex.c:3840
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3840
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b615c0a4 of 4 bytes by task 14135 on cpu 1:
 attach_to_pi_owner+0x64/0x4c0 kernel/futex.c:1236
 lookup_pi_state kernel/futex.c:1323 [inline]
 futex_requeue+0xb74/0x1520 kernel/futex.c:2080
 do_futex+0x153c/0x21c0 kernel/futex.c:3834
 __do_sys_futex kernel/futex.c:3872 [inline]
 __se_sys_futex+0x26d/0x330 kernel/futex.c:3840
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3840
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14135 Comm: syz-executor.2 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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